Solar heat collection device

Abstract

The invention provides a solar heat collection device which comprises a heat collection pipe and a header, the heat release end of the heat collection pipe is inserted into the header, the header comprises a shell and a header pipe arranged in the shell, and a heat preservation material is arranged between the shell and the header pipe; the header pipe is thermally connected with the heat release end of the heat collection pipe through a heat conduction block; the heat conduction block comprises a circular ring structure and a blocky structure which are in thermal connection with each other, the united collecting pipe is inserted into the circular ring structure, a hole is formed in the blocky structure, the heat release end of the heat collecting pipe is inserted into the hole, and the heat release end of the heat collecting pipe is in thermal connection with the united collecting pipe through the circular ring structure and the blocky structure; the heat release ends of the heat collecting pipes are perpendicular to the header pipes. According to the invention, the phenomenon that a heat pipe heat collector in the prior art is easy to scale in a header flow channel is avoided, the scaling phenomenon is weakened, and meanwhile, the pressure drop at the two ends of the header is reduced.

Description

Technical Field

[0001] This invention belongs to the field of solar collector technology, and in particular relates to a solar thermal collector device. Background Technology

[0002] Currently, commonly used solar collector manifolds in my country mainly consist of an outer shell, insulation layer, manifold, and heat-conducting blocks. The outer shell is typically made of metal or PVC, its main function being to provide structural support for the manifold while also requiring corrosion and aging resistance. The insulation layer is usually made of insulating cotton, its main function being to prevent heat loss from the manifold and heat-conducting blocks to the surrounding environment through the outer shell. The manifold is generally made of copper, and the heat-conducting blocks are also commonly made of copper. The heat-conducting blocks are generally cylindrical and machined into the manifold channels, perpendicular to the flow direction. The working principle is as follows: the condensing section of the heat pipe is connected to the heat-conducting block. After the working fluid in the heat pipe releases heat at the condensing end, the heat is transferred to the working fluid inside the manifold through the heat-conducting block. Because the heat-conducting block is machined inside the manifold channels, and the diameter of the manifold is relatively small, scale easily forms on the outside of the heat-conducting block inside the manifold channels (when the working fluid is water), affecting the service life and heat exchange efficiency of the heat pipe collector, increasing maintenance costs, and also limiting the possibility of increasing the diameter of the manifold.

[0003] Existing technologies include welding heat-conducting blocks to the outside of manifolds. However, this welding process increases the thermal resistance between the heat-conducting blocks and the manifolds, affecting heat exchange efficiency. Chinese utility model patent CN220119595U proposes a solar manifold collector. It improves the insulation effect of the manifold by providing multiple through holes on both sides of the manifold and filling the annular space formed by the outer and inner shells with foamed cement. However, it does not consider mitigating scaling. Chinese utility model patent CN221146836U discloses a solar collector with a non-powered manifold. This design involves three heat exchange corrugated pipes inside the manifold, each covered by a straight steel pipe with several through holes. The ends of the straight steel pipes are sealed to the heat exchange corrugated pipes with conical silicone sleeves. This design, which uses straight steel pipes to support the heat exchange corrugated pipes, is structurally complex and costly.

[0004] Therefore, this solution proposes a solar collector manifold device to solve the technical problems of easy scaling, low heat exchange efficiency, and difficulty in increasing the diameter of the manifold. Summary of the Invention

[0005] The purpose of this invention is to provide a solar collector manifold device that solves the technical problems of easy scaling, low heat exchange efficiency, and difficulty in increasing the diameter of the manifold in the prior art. A heat-conducting block is placed on one side of the manifold and connected to it via a ring structure. The manifold is internally machined with a threaded structure. On the one hand, since there is no heat-conducting block inside the manifold except for the threaded structure, scaling can be greatly reduced. Simultaneously, the threaded structure enhances convective heat transfer, thereby improving heat exchange efficiency. On the other hand, the diameter of the manifold can be increased according to process requirements.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: A solar thermal collector includes a collector tube and a manifold. The heat-dissipating end of the collector tube is inserted into the manifold. The manifold includes a shell and a manifold pipe disposed within the shell. Insulation material is disposed between the shell and the manifold pipe. The manifold pipe and the heat-dissipating end of the collector tube are thermally connected via a heat-conducting block. The heat-conducting block includes a ring structure and a block structure thermally connected to each other. The manifold pipe is inserted into the ring structure, and the block structure has holes in which the heat-dissipating end of the collector tube is inserted. The heat-dissipating end of the collector tube and the manifold pipe are thermally connected via the ring structure and the block structure. The heat-dissipating end of the collector tube and the manifold pipe are arranged perpendicularly.

[0007] As an improvement, the diameter of the annular structure is slightly larger than the diameter of the manifold.

[0008] As an improvement, the annular structure of the heat-conducting block is connected to the manifold by expansion or threading, so that the annular structure of the heat-conducting block and the manifold have good contact.

[0009] As an improvement, the diameter of the cylindrical hole is equal to the diameter of the heat pipe condenser section, and the depth of the cylindrical hole is slightly greater than the length of the heat pipe condenser section, so that the heat pipe condenser section can be inserted into the cylindrical hole of the heat-conducting block and make good contact.

[0010] As an improvement, the heat-conducting block device is integrally formed by casting.

[0011] As an improvement, a sealing ring is provided at the connection between the manifold and the heat collection pipe.

[0012] As an improvement, the manifold is a cylindrical pipe with an internal threaded structure.

[0013] As an improvement, the ring structure and the block structure are provided, wherein the block structure is provided with an arc-shaped structure corresponding to the ring structure.

[0014] Compared with the prior art, the present invention has the following advantages: This design places the heat-conducting block on one side of the manifold and connects it to the manifold via an expansion joint or threaded connection using a ring structure, increasing the contact area. The manifold's interior is machined with a threaded structure to enhance convective heat transfer. The heat-conducting block is machined as a single piece, reducing contact thermal resistance. The threaded structure inside the manifold further enhances convective heat transfer. Furthermore, the absence of a heat-conducting block inside the manifold significantly reduces scaling. The manifold diameter can also be increased according to process requirements. Attached Figure Description

[0015] Figure 1 This is a front view of the heat pipe collector in an embodiment of the present invention.

[0016] Figure 2 This is a front view of the heat pipe collector in an embodiment of the present invention.

[0017] Figure 3 This is a three-dimensional diagram of the manifold and heat-conducting block in an embodiment of the present invention.

[0018] Figure 4 This is a three-dimensional diagram of the manifold in an embodiment of the present invention.

[0019] Figure 5a , Figure 5b This is a schematic diagram of a single heat-conducting block device in an embodiment of the present invention.

[0020] Figure 6 This is a perspective view of the heat pipe collector in an embodiment of the present invention.

[0021] Figure 7 A perspective view of the conventional solar collector of this invention.

[0022] The attached diagram is labeled as follows: 1. Manifold shell; 2. Heat-conducting block; 3. Connecting pipe; 4. Heat-dissipating end of heat-collecting pipe; 5. Heat-absorbing end of heat-collecting pipe; 6. Heat-collecting pipe. Detailed Implementation

[0023] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0024] See Figures 1-6 A solar thermal collector device includes a collector tube 6 and a manifold. The heat-dissipating end 4 of the collector tube is inserted into the manifold. The manifold includes a shell 1 and a manifold 3 disposed within the shell. Insulation material 10 is disposed between the shell 1 and the manifold 3. The manifold and the heat-dissipating end of the collector tube are thermally connected by a heat-conducting block 2. The heat-conducting block includes a ring structure 8 and a block structure 9 that are thermally connected to each other. The manifold 3 is inserted into the ring structure 8. The block structure has holes 7, and the heat-dissipating end 4 of the collector tube is inserted into the holes. The heat-dissipating end 4 of the collector tube and the manifold 3 are thermally connected by the ring structure and the block structure. The heat-dissipating end of the collector tube and the manifold are arranged vertically.

[0025] The device provided by this invention avoids the problems of easy scaling and low heat exchange efficiency in the manifold channel of heat pipe collectors in the prior art by setting a heat-conducting block externally. The heat-conducting block is placed on one side of the manifold and connected to the manifold through a ring structure, which increases the contact area and thus improves the heat exchange efficiency. In addition, there are no extra structures inside the manifold, and the diameter of the manifold can be increased according to the engineering requirements of the heat collection field, thereby reducing the formation of scaling and reducing the pressure drop at both ends of the manifold.

[0026] As an improvement, the diameter of the annular structure is slightly larger than the diameter of the manifold. The annular structure of the heat-conducting block is fitted onto the outside of the manifold.

[0027] As an improvement, fluid inlets and outlets are provided on both the left and right sides of the manifold. Water is the preferred fluid.

[0028] As an improvement, the annular structure of the heat-conducting block is connected to the manifold by expansion or threading, so that the annular structure of the heat-conducting block and the manifold have good contact.

[0029] As an improvement, the diameter of the cylindrical hole is equal to the diameter of the heat pipe condenser section, and the depth of the cylindrical hole is slightly greater than the length of the heat pipe condenser section, so that the heat pipe condenser section can be inserted into the cylindrical hole of the heat-conducting block and make good contact.

[0030] As an improvement, the heat-conducting block device is integrally formed by casting. It eliminates the need for welding or other methods of assembly. The heat-conducting block is machined as a single piece, reducing contact thermal resistance.

[0031] As an improvement, a sealing ring is provided at the connection between the manifold and the heat collection pipe.

[0032] As an improvement, the manifold is a cylindrical pipe with an internal threaded structure. This enhances convective heat transfer, and the elimination of heat-conducting blocks inside the manifold significantly reduces scaling.

[0033] As an improvement, the insulation material is insulation cotton.

[0034] As an improvement, the ring structure and the block structure are connected, and the block structure is provided with an arc-shaped structure corresponding to the ring structure.

[0035] As an improvement, the heat collection tube is a double-layered vacuum glass tube.

[0036] The heat-conducting block 2 has a cylindrical hole 7. The diameter of the cylindrical hole 7 is equal to the diameter of the condensing end of the heat pipe, and the depth of the cylindrical hole 7 is slightly greater than the length of the condensing section of the heat pipe, so that the condensing section of the heat pipe can be inserted into the cylindrical hole 7 of the heat-conducting block and make good contact.

[0037] The outer side of the manifold 3 is provided with a shell, forming a header.

[0038] As an improvement, multiple parallel manifolds 3 are provided. Preferably, two parallel manifolds are provided. For example... Figure 5b As shown, the block structure 9 has ring structures on both the top and bottom, which allows two parallel manifolds 3 to be set up at the top and bottom.

[0039] As an improvement, the fluid flow directions in adjacent connecting pipes are opposite. Because the heat-conducting block is a heat conductor, the fluids in adjacent manifolds can exchange heat through it. This allows for heat exchange between the fluids in adjacent manifolds, enabling heat complementarity between them. The higher-temperature fluid in one pipe transfers heat to the lower-temperature fluid, which then cools down and absorbs heat from the collector pipe, maximizing heat exchange. The opposite flow directions of the water in adjacent manifolds further maximize heat exchange, achieving true counter-current flow.

[0040] As an improvement, the thermal conductivity of the heat-conducting blocks varies at different locations, gradually decreasing from the center of the manifold towards the left and right sides. When adjacent manifolds flow in counter-current mode, the inlet and outlet of the manifold are located on the left and right sides respectively. This maximizes the temperature difference between the two locations and achieves the best heat exchange effect. This is because increasing the thermal conductivity at the center enhances the heat exchange, resulting in a more balanced heat exchange along the entire length, thus achieving optimal heat exchange performance. Furthermore, it saves on material costs, enabling high-efficiency heat exchange at a low cost.

[0041] As an improvement, the thermal conductivity decreases at an increasingly greater rate from the center of the heat-conducting block towards the left and right sides. This design further enhances the heat exchange effect, ensuring a more balanced overall heat exchange and ultimately achieving optimal heat exchange performance.

[0042] As an improvement, the distance between adjacent heat-conducting blocks varies at different locations, gradually increasing from the center of the manifold towards the left and right sides. When adjacent manifolds flow in counter-current mode, the inlet and outlet of the manifold are located on the left and right sides respectively. This maximizes the temperature difference between the two and achieves the best heat exchange effect. Increasing the distance at the center enhances the heat exchange, ensuring a more balanced heat exchange along the overall length, thus achieving optimal heat exchange performance.

[0043] As an improvement, the distance between adjacent heat-conducting blocks gradually increases from the center of the manifold towards the left and right sides. This arrangement further enhances the heat exchange effect, ensuring overall heat exchange is balanced and achieving optimal heat exchange performance.

[0044] As an improvement, the inner diameter of the heat-conducting block ring is d1, and the inner diameter of the cylindrical hole is d2, where d1 is 4-6 times d2, preferably 5 times. These dimensions ensure efficient heat exchange. The hole depth is L1, and the length of the heat-dissipating section of the heat-collecting tube is L2, where L1 is 2.1-2.2 times L2. A hole depth slightly greater than twice the length of the heat-dissipating section of the heat pipe ensures efficient heat dissipation.

[0045] The distance L3 between the center point of the annular structure and the center point of the block structure is 0.5-0.7 times the inner diameter of the heat-conducting block annular ring. Through the optimization of the above dimensions, the best heat exchange efficiency can be ensured while maintaining a compact structure.

[0046] The heat-conducting block material can be copper or stainless steel.

[0047] Preferably, the inner diameter of the circular hole is 8mm, equivalent to the diameter of the heat-dissipating section of the heat pipe, and the depth of the circular hole is 20mm, slightly greater than twice the length of the heat-dissipating section of the heat pipe; the inner diameter of the ring structure is 100mm, the wall thickness is 2mm, and the width is 30mm; the length, width, and height of the block structure are 200mm, 30mm, and 40mm, respectively; the distance between the center point of the ring structure and the center point of the block structure is 60mm, and the two ring structures are symmetrically distributed on both sides of the center position of the block structure. The heat-conducting block material can be copper or stainless steel. The thermal conductivity of copper is approximately 379W / (m·K), and the thermal conductivity of stainless steel is approximately 13-30W / (m·K).

[0048] The specific working process of this invention: Because the heat-conducting block 2 in a conventional header is located inside the manifold 3, scaling easily occurs near the heat-conducting block when the working fluid is water, resulting in low heat exchange efficiency at this location. This solution does not require large-scale modifications to the existing header; it only requires machining the heat-conducting block 2 and fitting its annular device onto the manifold 3 to increase the contact area and enhance heat exchange, while also reducing pressure loss in the pipeline. Machining the inner side of the manifold 3 with a threaded structure improves the convective heat transfer effect within the manifold flow channel, and the diameter of the manifold can also be appropriately increased or decreased according to project requirements.

[0049] While the present invention has been disclosed above with reference to preferred embodiments, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A solar thermal collector, comprising a collector tube and a manifold, wherein the heat-dissipating end of the collector tube is inserted into the manifold, the manifold comprising a shell and a manifold disposed within the shell, and an insulation material is disposed between the shell and the manifold; the manifold and the heat-dissipating end of the collector tube are thermally connected via a heat-conducting block; the heat-conducting block comprises a ring structure and a block structure thermally connected to each other, the manifold being inserted into the ring structure, and the block structure having holes into which the heat-dissipating end of the collector tube is inserted, the heat-dissipating end of the collector tube and the manifold being thermally connected via the ring structure and the block structure; the heat-dissipating end of the collector tube and the manifold are arranged perpendicularly.

2. The solar thermal collector as described in claim 1, characterized in that, The diameter of the annular structure is slightly larger than the diameter of the manifold.

3. The solar thermal collector as described in claim 1, characterized in that, The annular structure of the heat-conducting block is connected to the manifold by expansion or threading, ensuring good contact between the annular structure of the heat-conducting block and the manifold.

4. The solar thermal collector as described in claim 1, characterized in that, The diameter of the cylindrical hole is equal to the diameter of the heat pipe condenser section, and the depth of the cylindrical hole is slightly greater than the length of the heat pipe condenser section, so that the heat pipe condenser section can be inserted into the cylindrical hole of the heat-conducting block and make good contact.

5. The solar thermal collector as described in claim 1, characterized in that, The heat-conducting block device is integrally formed by casting.

6. The solar thermal collector as described in claim 1, characterized in that, A sealing ring is provided at the connection between the manifold and the heat collection pipe.

7. The solar thermal collector according to claim 1, characterized in that, The manifold is a cylindrical pipe with an internal threaded structure.

8. The solar thermal collector according to claim 1, characterized in that, The circular structure and the block structure are connected, and the block structure is provided with an arc-shaped structure corresponding to the circular structure.

9. The solar thermal collector according to claim 1, characterized in that, Multiple manifolds are set up in parallel.

10. The solar thermal collector according to claim 1, characterized in that, Two parallel block structures are arranged, with symmetrical circular structures along the center of the block structure, so that two parallel manifolds are set up above and below, and the fluid flow in adjacent connecting pipes is in opposite directions.

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